TiF_3对氢化燃烧合成Mg_(95)Ni_5放氢性能的影响  

Effect of TiF_3 on the Hydrogen Desorption Property of Mg_(95)Ni_5 by Hydriding Combustion Synthesis

作　　者：蔡浩[1] 顾昊[1] 朱云峰[1] 李李泉[1] 

机构地区：[1]南京工业大学,江苏南京210009

出　　处：《稀有金属材料与工程》2010年第1期50-54,共5页Rare Metal Materials and Engineering

基　　金：国家高技术研究发展计划("863"计划-2007AA05Z110);江苏省科技厅高技术研究(工业)重大项目(BG2007052);国家自然科学基金项目(50871052)

摘　　要：研究了TiF3的添加对氢化燃烧合成Mg95Ni5放氢性能的影响。添加1%(摩尔分数,下同)TiF3机械球磨10h可使Mg95Ni5的放氢性能达到最佳,在523K时,1800s内的放氢量可达到5.20%(质量分数,下同),并使放氢反应的表观活化能从Mg95Ni5的124kJ/mol降低到86kJ/mol。研究表明,TiF3的催化作用可归因于生成的MgF2和Tix+的氢化物减弱了Mg-H鍵。Effect of TiF3 addition as the catalyst on the hydrogen desorption property of Mg9sNi5 composites by hydriding combustion synthesis （HCS） was investigated. Addition of 1% TiF3 （molar fraction） can get the best hydrogen desorption property for Mg95Ni5 mechanically milled for 10 h, which could desorb 5.20% （mass fraction） of H2 in 1800 s at 523 K. The apparent activation energy of hydrogen desorption for Mg95Ni5＋1%TiF3 milled for 10 h was decreased to 86 kJ/mol from 124 kJ/mol of Mg95Ni5. Results show that catalytic effect of TiF3 could be attributed to the formation of MgF2 and Tix＋ hydrides which destabilize the bonding of Mg-H.

关 键 词：放氢性能 TiF3 催化作用 

分 类 号：TG139.7[一般工业技术—材料科学与工程]